Understanding the Wells Score

The Wells score is a number that reflects your risk of developing deep vein thrombosis (DVT). DVT happens when a blood clot forms in a vein that’s deep inside your body, usually in your leg. Your Wells score is calculated based on several factors. Using this score, your doctor can determine your likelihood of having DVT. This helps your doctor decide whether to proceed with further diagnostic testing, such as a CT scan.

Your doctor will interpret your Wells score based on either a two-tier or three-tier model. If your score indicates you have a higher risk of DVT, your doctor might do additional testing, such as a venogram.

Two-tier model

Score

Result

2 or higher

DVT is likely

1 or lower

DVT is not likely

Three-tier model

Your Wells score can help your doctor determine your risk of developing DVT. If your score indicates you have a higher risk, your doctor may suggest additional testing to look for a blood clot. If your risk is low, they may simply monitor you for any new symptoms.

Medically reviewed by Alana Biggers, MD on November 14, 2017 — Written by Jill Seladi-Schulman PhD